[OE-core] [PATCH] devtool: fix handling of unicode characters from subprocess stdout

[Stephano Cetola]

On 11/11, Burton, Ross wrote:
> A reader is definitely the right thing here, but I'm wondering why this
> needs to loop on single characters.  As I understand it doing a read() on a
> reader wrapping stdout will read until it blocks (because the process
> hasn't got anything to output) so result in less pointless iterating.
> 
> Ross

I've tested this and it fixes the issue, and resolves this bug:
https://bugzilla.yoctoproject.org/show_bug.cgi?id=10649

We may be able to stream this without blocking using
Queue.get_nowait(). This could solve the looping issue as well, as
you'd be looping over stdout.readline and placing that in the queue,
rather than looping over each character.